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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7be6c5008990da7e66723d154ab60e33d5dcea70ae877e7d3cd5de30608b2fb' 
  AND token = 'nJN3xYnGPLRJaxmEq+C5AspquB/GQWpHtCYfwrJdN6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}